package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    /**
     *
     * @param file:封装上传的文件
     * @return
     */
    @PostMapping("/upload")
    public R<String> fileLoad(MultipartFile file){
        //获取文件原始名称
        String originalFilename = file.getOriginalFilename();
        //获取图片后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //生成随机文件名
        String fileName = UUID.randomUUID().toString() + suffix;
        File dir=new File(basePath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        //通过io流回显图片
        try {
            FileInputStream fis=new FileInputStream(basePath+name);
            ServletOutputStream os = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            byte[] bytes=new byte[1024];
            while ((len=fis.read(bytes))!=-1){
                os.write(bytes,0,len);
                os.flush();
            }
            fis.close();
            os.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
